Steering position adjustment device

ABSTRACT

The present invention relates to a steering device of the type which carries out tilt/telescopic adjustments using front-back dual-location clamping/fastening bolts disposed at front and back, two locations, and has objects to stabilize and improve operation at the time of a tilt/telescopic adjustment thereof, and to provide better lever operation feeling. The steering device comprises a fixed bracket  1 ; a movable bracket  2 , to which a steering column  10  is attached; two sets of through holes  3, 3  consisting of front and back through hole sets, which are formed in the fixed bracket  1  and movable bracket  2 , respectively, and at least one set of which is constituted by a transverse slot  3   a  and a vertical slot  3   b  intersecting each other; two clamping/fastening bolts  5, 5 , which are inserted through these through holes  3, 3 ; an arm member  6 , which screws on each of the clamping/fastening bolts  5 ,; an operating lever member  9 ; a retaining member  7  for holding the clamping/fastening bolts  5, 5 , which are screwed in the above-mentioned arm member  6  and operating lever member  9 , respectively, at the centers of turning, so as to be spaced by a predetermined distance; and a linking member  8 , which is pivotally linked to the above-mentioned arm member  6  and operating lever member  9.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention is a steering device of the type which carries out tilt/telescopic adjustments using two clamping/fastening bolts disposed at front and back locations, and relates to a steering position adjustment device, which can stabilize and improve operation at the time of tilt/telescopic adjustment thereof, and can improve the operating feeling of lever operation.

[0003] 2. Description of the Related Art

[0004] As for a steering column comprising a tilt/telescopic adjustment device, there have existed for some time those of the type in which a fixed bracket and a movable bracket are supported by a front-back dual-location tightening screwing device, and the fixed bracket and movable bracket are tightened and loosened by the tightening and loosening thereof.

[0005] This tilt/telescopic adjustment device is constituted such that, when an operating lever is loosened, a tightening screwing device of the operating lever and a tightening device of an arm member are set in a linked state by a linking member. As for the tightening device, since only the intermediate shaft portion is restrained by a locking member of the head portion of the tightening device on the opposite side to the operating lever and arm member, and the shaft-end of the tightening screwing device on the side of the operating lever and arm member is in a free state in contrast to the fixed state of the opposite side thereof resulting from the restraining of the end, the tightening device will arbitrarily move in any direction, upward or downward, forward or backward.

[0006] In the rotating operation of the operating lever thereof, the shafts therebetween of the operating lever and arm member fluctuate in accordance with the movement and twisting of the shafts therebetween, the tightening force is dispersed and freed due to the movement thereof, and, accordingly, there is the danger that insufficient retaining force will be achieved, and further, there are times when tightening cannot be made stable, and the operating feeling is impaired.

[0007] The irregular movement of the operating lever and arm member at tilt/telescopic adjustment thereof cannot be suppressed by a simple structure. Furthermore, the above-mentioned example is such that the tightening screwing devices of both the operating lever and the arm member are inserted and positioned inside intersecting long holes comprising a transverse slot and a vertical slot, but irregular movement is not limited thereto, and the same problem exists with a tilt/telescopic adjustment device in which the tilt/telescopic steering operating lever, arm member and linking member are tightened at two locations.

[0008] For example, firm retaining force can be achieved, tightening force can be made stable, and the operating feeling of lever operation can be made extremely better without moving the operating lever and arm member at tightening time. Further, a fixed structure, which links one operating lever and arm member to one bracket via a linking member, and which provides a dual-location tightening device, has the conventional merit of being able to be tightened by a rotating operation of a lever, but, the problem is that because there are dual-location tightening devices on one bracket, while more secure fastening is possible than with a single tightening device type, the operational stability and operating feeling thereof cannot be easily improved.

SUMMARY OF THE INVENTION

[0009] Accordingly, as a result of the inventors conducting studious research to solve the above-mentioned problems, the present invention is accomplished to provide a steering position adjustment device comprising a fixed bracket; a movable bracket, to which a steering column is attached; two sets of through holes consisting of front and back through hole sets, which are formed in the fixed bracket and movable bracket, respectively, and at least one set of which is constituted by a transverse slot and a vertical slot intersecting each other; two clamping/fastening bolts which are inserted through these through holes; an arm member, which screws on each of the clamping/fastening bolts; an operating lever member; a retaining member for holding the clamping/fastening bolts, which are screwed in the above-mentioned arm member and operating lever member, respectively, at the centers of turning, so as to be spaced by a predetermined distance; and a linking member, which is pivotally linked to the above-mentioned arm member and operating lever member, so that support is provided by the through holes formed at two locations, and the fastening of the fixed and movable brackets by the two clamping/fastening bolts inserted through the through holes at the respective two locations. As a result of such constitution, it is possible to provide positional adjustment on a steering column having a stopper mechanism, which is capable of stabilizing, at a suitable position, a tightening position and a loosening position of the operating lever, which has an arm linked via the above-mentioned linking member, irregardless of the movement position of the movable bracket relative to the fixed bracket, thus solving the above-mentioned problems.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010]FIG. 1 is a side view of the present invention;

[0011]FIG. 2A is separate side views of a fixed bracket and a movable bracket, and

[0012]FIG. 2B is a partial cross-section plan view of an assembled fixed bracket and movable bracket;

[0013]FIG. 3A is an exploded perspective view of the principle parts of the present invention, and

[0014]FIG. 3B is an exploded perspective view of the principal parts of the present invention using a retaining member of another embodiment;

[0015]FIG. 4A is an operation diagram of the principal parts of a tilt/telescopic adjustment, which makes the pivotal linkage distance of a linking member smaller relative to the shaft support distance of a retaining member, and

[0016]FIG. 4B is an abbreviated line drawing showing the operation of A;

[0017]FIG. 5A is an operation diagram of the principal parts of a tilt/telescopic adjustment, which makes the pivotal linkage distance of a linking member larger relative to the shaft support distance of a retaining member, and

[0018]FIG. 5B is an abbreviated line drawing showing the operation of A;

[0019]FIG. 6 is a cross-sectional view of the principal parts of the present invention using a retaining member, which forms a recessed portion;

[0020]FIG. 7 is a side view of the principal parts of the present invention, in which the retaining member and linking member are set at equal distance; and

[0021]FIG. 8A is a partial cross-section plan view showing an embodiment in which a head side retaining member is disposed on the bolt head portion side of two clamping/fastening bolts, and

[0022]FIG. 8B is a perspective view showing a clamping/fastening bolt and a locking member.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The embodiments of the present invention will be explained hereinbelow based on the figures. Firstly, a first embodiment of the present invention is constituted by a fixed bracket 1 and a movable bracket 2, and fixed bracket 1 thereof is affixed to a prescribed location of a car body, and the above-mentioned movable bracket 2 is supported by fixed bracket 1 (Refer to FIG. 1, and FIGS. 2A, B). And there is constituted a steering wheel position adjustment portion, comprising a through hole 3 on the cross direction of both sides of a bracket constituted by fixed bracket 1 and movable bracket 2.

[0024] Fixed bracket 1 thereof is constituted by a pair of right-left support side plates 1 a and mounting plate portions 1 b. The two support side plates 1 a, 1 a sandwich and hold movable bracket 2, which will be explained hereinbelow. The two mounting plate portions 1 b, 1 b are mounted via capsule members 11, 11 and the like at a prescribed position inside a vehicle, and constitute a structure, which absorbs impact energy while sliding against resistance relative to the mounting position only when a collision or other such shock occurs, softening the impact and protecting a driver from an accident (Refer to FIGS. 1A, B, FIG. 2 and so on).

[0025] Next, movable bracket 2 is mounted in a sandwiched state between the two support side plates 1 a, 1 a of the above-mentioned fixed bracket 1. Movable bracket 2 thereof is constituted by a column support member 2 a and a movable support member 2 b. Column support member 2 a is a member, which serves to support and affix a steering column 10. Further, the two movable support members 2 b, 2 b are mounted to the above-mentioned fixed bracket 1 so as to enable position adjustment as the occasion may demand (Refer to FIG. 2B).

[0026] Next, through holes 3 are constituted either by a transverse slot 3 a and vertical slot 3 b, or by a transverse slot 3 a and round hole 3 c. And these through holes 3 performs the role of allowing the above-mentioned fixed bracket 1 and movable bracket 2 to carry out a tilt operation and telescopic operation. The vertical slot 3 b mainly performs a tilt adjustment, and the transverse slot 3 a mainly performs a telescopic adjustment.

[0027] A tilt adjustment of the rotation operation surface of a steering wheel W can be carried out by through holes 3, 3 (Refer to FIG. 1). The above-mentioned fixed bracket 1 is provided with a pair of left and right vertical slots 3 b, which pass through two support side plates 1 a, 1 a thereof, and two sets of these vertical slots 3 b are formed along the longitudinal direction (equivalent to the axial direction of the steering column) of fixed bracket 1 (Refer to FIG. 3B).

[0028] Similarly, movable support member 2 b of movable bracket 2 is provided with a pair of left and right transverse slots 3 a, which extend in the widthwise direction, and two sets of these transverse slots 3 a are formed along the longitudinal direction of movable support member 2 b (Refer to FIG. 3B). Further, there also exists an embodiment in which through hole 3, which is composed of vertical slot 3 b and transverse slot 3 a, is provided only on one side, while through hole 3 of the other side is composed of a transverse slot 3 a and a round hole 3 c, so that a telescopic adjustment operation (or an operation including a small-scale tilt adjustment) is mainly performed (Refer to FIG. 2A and FIG. 3A).

[0029] Then, movable support members 2 b, 2 b of movable bracket 2 are assembled so as to be sandwiched by the two support side plates 1 a, 1 a of fixed bracket 1, through holes 3, 3 are formed by positioning the above-mentioned vertical slot 3 b and transverse slot 3 a to intersect each other approximately in an cross shape, and then clamping/fastening bolts 5, 5 are inserted through these through holes 3, 3.

[0030] Movable support member 2 b of movable bracket 2 is pressed and affixed to support side plate 1 a of fixed bracket 1 by tightening force resulting from screwing the clamping/fastening bolt 5 thereof into an inner screw portion 6 a of arm member 6, which will be explained later (Refer to FIG. 1 and FIG. 2B). The above-mentioned inner screw portion 6 a, as shown in FIG. 3A, is made a separate member from arm member 6, but is mounted securely to the main body of arm member 6.

[0031] Alternatively, inner screw portion 6 a can also be integrally formed with the main body of arm member 6. Arm member 6 is attached to either one of the two clamping/fastening bolts 5, 5, and this arm member 6 rotates by screwing onto clamping/fastening bolt 5, and can perform the tightening and loosening of fixed bracket 1 and movable bracket 2 (Refer to FIG. 2B).

[0032] As explained hereinabove, a vertical slot 3 b is formed in both support side plates 1 a, 1 a of fixed bracket 1, and a transverse slot 3 a is formed in movable support members 2 b, 2 b of movable bracket 2. However, in contrast to the above, the above-mentioned vertical slot 3 b can be formed in the movable bracket 2 side, and the above-mentioned transverse slot 3 a can be formed in the fixed bracket 1 side.

[0033] And then, a tilt operation is performed by movable bracket 2 moving parallel to the longitudinal direction of vertical slot 3 b relative to fixed bracket 1, and a telescopic operation can be performed by movable bracket 2 moving parallel to the longitudinal direction of transverse slot 3 a. And then, a tilt/telescopic position can be securely affixed by tightening the clamping/fastening bolt 5 in a state in which the position of the steering wheel W is set in a desired tilt/telescopic position.

[0034] The above-mentioned arm member 6 is a rotating member of a flat plate shape, which extends radially from a screwing portion of the above-mentioned clamping/fastening bolt 5 (Refer to FIG. 1). As for the arm member 6 thereof, inner screw portion 6 a, which screws onto a screwing portion 5 a of clamping/fastening bolt 5, is formed. This inner screw portion 6 a screws onto the above-mentioned screwing portion 5 a, and by the rotating operation of the arm member 6 thereof, the bolt head portion 5 b of the clamping/fastening bolt 5 and the arm member 6 apply pressure to the support side plates 1 a, 1 a of the fixed bracket 1, enabling fixed bracket 1 to sandwich and affix movable bracket 2 (Refer to FIG. 2B).

[0035] Further, a pivoting portion 6 b is formed on arm member 6 at a predetermined distance from the above-mentioned inner screw portion 6 a. This pivoting portion 6 b is a part, to which a linking member 8, which will be explained hereinbelow, is mounted so as to be able to swing. The linking member 8 thereof forms a shaft shape, which makes a long slender shape of a flat plate shape, and the above-mentioned arm member 6 and operating lever member 9 are mounted at the two shaft ends thereof so as to swing (Refer to FIG. 1).

[0036] The linking member 8 thereof is pivotally linked via a pin member or the like to pivoting member 6 b of arm member 6 and a pivoting member 9 b of operating lever member 9 (Refer to FIG. 1, and FIG. 3A). The above-mentioned arm member 6 and operating lever member 9 constitute a linking mechanism in accordance with the above-mentioned linking member 8, and arm member 6 is linked so as to constantly rotate in the same direction via linking member 8, and performs a rotating motion.

[0037] As for the operating lever member 9 thereof, an inner screw portion 9 a, which screws onto the above-mentioned clamping/fastening bolt 5, is formed, and performs the tightening and loosening of the clamping/fastening bolt 5 thereof, and further, also performs the tightening and loosening of the above-mentioned arm member 6 to the clamping/fastening bolt 5 of the arm member 6 side via the above-mentioned linking member 8.

[0038] A retaining member 7 is attached between the shafts of the clamping/fastening bolt 5 of the operating lever member 9 and the clamping/fastening bolt 5 of arm member 6 thereof. This retaining member 7 serves to retain arm member 6 and operating lever member 9 at a constant distance at all times. This retaining member 7 is such that distance retaining holes 7 b, 7 b, through which the above-mentioned two clamping/fastening bolts 5, 5 pass, are formed at both longitudinal ends of a flat plate portion 7 a (Refer to FIG. 3A, B). The retaining member 7 thereof is arranged on fixed bracket 1 by way of a washer or the like, supports both clamping/fastening bolts 5, 5 at the distance retaining holes 7 b, 7 b, and maintains the above-mentioned arm member 6 and operating lever member 9 at a predetermined distance (Refer to FIG. 1 and FIG. 2B).

[0039] The retaining member 7 thereof is constituted so as to cause a separation from the above-mentioned fixed bracket 1 between the above-mentioned fixed bracket 1 and the tightening parts of the two locations of the two clamping/fastening bolts 5, 5, that is, to form a recessed portion 7 a ₁ that creates a non-contact state, reducing the contact area between the above-mentioned fixed bracket 1 and retaining member 7, and, in turn, improving operation at tilt/telescopic adjustment.

[0040] The simplest method for forming the recessed portion 7 a ₁ thereof is to provide a washer between fixed bracket 1 and retaining member 7. Furthermore, as shown in FIG. 1, FIG. 2A and FIG. 3A, it is possible to use a shape, which is cut off between the attaching parts of the two clamping/fastening bolts 5, 5 of the support side plate 1 a of the above-mentioned fixed bracket 1, and to make this cut-off part serve as the recessed portion 7 a ₁ of retaining member 7.

[0041] Further, there are also cases in which the central area of the flat plate portion 7 a, excluding the two longitudinal ends, is bent and formed into an approximate convex shape, and this convex shape part is used as recessed portion 7 a ₁, making a non-contact part with fixed bracket 1 (Refer to FIG. 3B). Further, the standing surface of the recessed portion 7 a ₁, which is bent to form the above-mentioned convex shape, can be used as a latching portion for rotation regulation of the above-mentioned operating lever member 9 and arm member 6. In the case of the above-mentioned retaining member 7, it is also possible to eliminate the need for a washer. Furthermore, it is also possible to form a cut-off part of a flattened concave shape in the surface of retaining member 7 opposite fixed bracket 1, and to use this cut-off part as recessed portion 7 a ₁, forming a non-contact part with the above-mentioned fixed bracket 1 (Refer to FIG. 6).

[0042] Further, there exists an embodiment, wherein a latching portion 7 c is formed on retaining member 7. This latching portion 7 c is such that, when either the above-mentioned operating lever member 9 or arm member 6 has rotated a fixed extent, the same makes contact with the latching portion 7 c thereof and stops, that is, it regulates the rotating range of operating lever member 9 and arm member 6 (Refer to FIG. 1).

[0043] This latching portion 7 c is formed by notching and bending up one portion of flat plate portion 7 a (Refer to FIG. 3A). Or, there are also cases in which a pin member or the like is mounted in a fixed condition to flat plate portion 7 a and used as latching portion 7 c, and the shape thereof is not limited in particular. Further, as explained hereinabove, the above-mentioned approximate convex-shaped recessed portion 7 a ₁ can also be made to serve as latching portion 7 c.

[0044] By providing latching portion 7 c for rotation regulation of the above-mentioned operating lever member 9 and arm member 6 on retaining member 7, it is possible to suppress the deflection movement of the clamping/fastening bolt 5 of operating lever member 9 and the clamping/fastening bolt 5 of arm member 6, and to easily regulate at a suitable range the rotation of the operating lever member 9 and arm member 6 thereof. In accordance therewith, it is possible to improve the operational stability of the linking mechanism of operating lever member 9 and arm member 6 without applying excessive force to the above-mentioned linking member 8.

[0045] Next, there exists an embodiment, wherein the distance between linkages on the above-mentioned linking member 8 with the above-mentioned operating lever member 9 and arm member 6 is set by being made to differ with the distance between the retaining member 7 retaining positions of the clamping/fastening bolts 5, 5 of operating lever member 9 and arm member 6. Here, the distance between linkages of the above-mentioned retaining member 7 is referred to as the shaft support distance La, and the distance between linkages of linking member 8 is referred to as the pivotal linkage distance Lb.

[0046] The shaft support distance La and pivotal linkage distance Lb thereof can be constituted such that, as shown in FIG. 7, when the dimensions thereof are equal and parallel, the rotating ranges of operating lever member 9 and arm member 6 are equal, and the tightening and loosening of the two clamping/fastening bolts 5, 5 are performed approximately equally in a well balanced manner.

[0047] Next, by making the pivotal linkage distance Lb either smaller or larger than the shaft support distance La, it is possible to make the rotating angles of the operating lever member 9 and arm member 6 differ, respectively. In accordance therewith, the vertical slot 3 b of operating lever member 9 and clamping/fastening bolt 5 can serve as the tilt support point when adjusting the position of the steering wheel W in the tilt direction.

[0048] That is, with a dual-location clamping/fastening device, comprising an arm member 6 side, which also serves a tilt direction support point role for fixed bracket 1 and movable bracket 2, and an operating lever member 9 side, which performs adjustment by being guided to an arbitrary position of the tilt direction, moving and adjusting the operating lever member 9 side to an arbitrary position while setting the arm member 6 side to a fixed state by slightly tightening the same sooner than the operating lever member 9 side improves operability even more (Refer to FIG. 4A).

[0049] Above, by shortening the pivotal linkage distance Lb of linking member 8 relative to the shaft support distance La of retaining member 7, the rotation ratios of operating lever member 9 and arm member 6 can be suitably changed, and the rotation quantity at the angle of rotation θb of the above-mentioned arm member 6 can be increased relative to the rotation quantity at the angle of rotation θa of operating lever member 9 (Refer to FIG. 4B).

[0050] In this embodiment, according to the relationship between the rotation ratios of operating lever member 9 and arm member 6 thereof, and the variable quantity of linkage movement resulting from the circular arc motion of linking member 8, it is possible to vary the rotation quantity at the angle of rotation θb of arm member 6 relative to the rotation quantity at the angle of rotation θa of operating lever member 9.

[0051] In this way, by making the pivotal linkage distance Lb of linking member 8 differ from the shaft support distance La of retaining member 7, and generating an angle of rotation ratio, and increasing or decreasing the size of the rotation quantity at the angle of rotation θb of arm member 6 relative to the rotation quantity at the angle of rotation θa of operating lever member 9, the tightening time of the clamping/fastening bolt 5 of the operating lever member 9 side and the clamping/fastening bolt 5 of the arm member 6 side can be made to differ according to circumstances.

[0052] Further, by making the pivotal linkage distance Lb of linking member 8 longer relative to the shaft support distance La of retaining member 7, similarly it is possible to suitably change the rotation ratios of operating lever member 9 and arm member 6, and to increase the angle of rotation Oa of operating lever member 9 relative to the angle of rotation θb of arm member 6 (Refer to FIG. 5A, B).

[0053] Furthermore, there are cases in which a head side retaining member 12 is attached to the bolt head portions 5 b, 5 b side of the above-mentioned two clamping/fastening bolts 5, 5 (Refer to FIG. 8A). This head side retaining member 12 is attached so as to be sandwiched between support side plate 1 a and bolt head portion 5 b. The head side retaining member 12 thereof is such that two retaining through holes 12 b, 12 b, through which the above-mentioned clamping/fastening bolts 5, 5 pass, are formed in the two longitudinal end parts of retaining plate portion 12 a.

[0054] According to the above-mentioned two retaining through holes 12 b, 12 b, the distance of the bolt head portions 5 b, 5 b side of the above-mentioned clamping/fastening bolts 5, 5 is maintained constant at all times. Further, head side retaining member 12 is bent and formed so as to be separated from the above-mentioned support side plate 1 a at the approximate center area of retaining plate portion 12 a, and furthermore, is constituted such that a locking member 13 of bolt head portion 5 b is attached to retaining plate portion 12 a. More specifically, an inner screw portion 12 c is formed in the above-mentioned retaining plate portion 12 a, and the above-mentioned locking member 13 is attached in a fixed condition to this inner screw portion 12 c by a fastening device 14 such as a bolt (Refer to FIG. 8B). As for the above-mentioned locking member 13, latching holes 13 a, 13 a of approximately the same shape as bolt head portion 5 b, into which bolt head portion 5 b is capable of being inserted, are formed. By inserting the above-mentioned bolt head portions 5 b, 5 b into the above-mentioned latching holes 13 a, 13 a, the bolt head portion 5 b part is latched by the above-mentioned latching hole 13 a, preventing clamping/fastening bolt 5 from slipping in the direction of the shaft circumference.

[0055] The invention of claim 1 relates to a steering position adjustment device comprising a fixed bracket 1; a movable bracket 2, to which a steering column 10 is attached; two sets of through holes 3, 3 consisting of front and back through hole sets, which are formed in the fixed bracket 1 and movable bracket 2, respectively, and at least one set of which is constituted by a transverse slot 3 a and a vertical slot 3 b intersecting each other; two clamping/fastening bolts 5, 5, which are inserted through these through holes 3, 3; an arm member 6, which screws on each of the clamping/fastening bolts 5, 5; an operating lever member 9; a retaining member 7 for holding the clamping/fastening bolts 5, 5, which are screwed in the above-mentioned arm member 6 and operating lever member 9, respectively, at the centers of turning, so as to be spaced by a predetermined distance; and a linking member 8, which is pivotally linked to the above-mentioned arm member 6 and operating lever member 9, whereby it is enabled to obtain effects of stabilizing and improving the operation of the steering column and the rotational operation of the operating lever member and so on, and of providing better feeling of lever operation when performing a tilt/telescopic adjustment.

[0056] If the above effects are explained in detail, since the shaft support distance La of the tightening shaft member of the operating lever member 9 and arm member 6 is securely maintained by retaining member 7, the action of the linkage, which links operating lever member 9 and arm member 6, can be made extremely better and stabilized. Even if linking member 8, operating lever member 9 and arm member 6 are securely linked together, it is impossible to deter the movement of the tightening shaft member of operating lever member 9 and arm member 6, and trouble occurs, such as stable tightening operation and operating feeling being lost due to the operation thereof, but in accordance with retaining member 7 of the present invention, it is possible to improve and stabilize operability in a dual-location clamping/fastening support device of one bracket, and to provide better operating feeling.

[0057] Next, the invention of claim 2 relates to the steering position adjustment device according to claim 1, wherein a shaft support distance La defined between the axes of the clamping/fastening bolts 5, 5 held by said retaining member 7 is different from a pivotal linkage distance Lb between the pivotal axes of said linking member 8, whereby the rotation ratios of operating lever member 9 and arm member 6 can be suitably changed to impart change to the tightening state of the clamping/fastening bolts 5, 5.

[0058] If the above effects are explained in detail, since the clamping/fastening bolt 5 of operating lever member 9 and arm member 6 can be securely retained by the above-mentioned retaining member 7, when the rotation transfer ratio is changed by making the pivotal linkage distance Lb of operating lever member 9 and arm member 6 differ from the retaining member 7 shaft support distance La of clamping/fastening bolt 5 of operating lever member 9 and clamping/fastening bolt 5 of arm member 6, for example, by setting the angle of rotation of arm member 6 such that it becomes larger than the angle of rotation of operating lever member 9 at initial operation, it is possible to easily adjust to an arbitrary adjustment position while setting the arm member 6 side to a tightened state, operability can be improved, and better operation feeling can be provided.

[0059] When the angle of rotation of operating lever member 9 and arm member 6 is changed like this, the deflection (movement) of the above-mentioned operating lever member 9 and arm member 6 at operation time can be deterred by retaining member 7, and the operability of the dual-location clamping/fastening device, which changes the angle of rotation, can be enhanced to the fullest.

[0060] The invention of claim 3 relates to the steering position adjustment device according to claim 2, wherein the pivotal linkage distance Lb of said linking member 8 is smaller than the shaft support distance La of said retaining member 7. As a result of such constitution, by way of a rotating operation of the above-mentioned operating lever member 9, different fastening timings can be obtained by making the angle of rotation θb of arm member 6 smaller than the angle of rotation θa of this operating lever member 9, and by making the rotation quantity at the angle of rotation θa of the operating lever member 9 and the rotation quantity at the angle of rotation θb of the arm member 6 variable. Further, according to this invention, it is possible to heighten the rigid feeling of linking member 8 by linking the operating lever member 9 and the arm member 6, and thus to further improve the operability.

[0061] The invention of claim 4 relates to the steering position adjustment device according to claim 2, wherein the pivotal linkage distance Lb of said linking member 8 is larger than the shaft support distance La said retaining member 7, whereby it is enabled to set the rotation ratios of the angle of rotation θa of the operating lever member 9 and the angle of rotation θb of the arm member 6 so as to make tightening timing differ by varying the rotation quantity of angle of rotation θb relative to the rotation quantity at the angle of rotation θa. In this case, the linking part of operating lever member 9 and arm member 6 can be provided arbitrarily, and a suitable rotation ratio can be set easily, and further, this rotation ratio can be set even when space is limited by the shapes of the fixed and movable brackets.

[0062] Next, the invention of claim 5 relates to the steering position adjustment device according to claims 1, 2, 3 or 4, the retaining member 7 forms a recessed portion 7 a ₁, which does not make contact with either the fixed bracket 1 or movable bracket 2. As a result of such constitution, the retaining member 7 and the fixed bracket 1 do not come into complete contact and, therefore, better tilt/telescopic adjustment feeling can be made when operating lever member 9 is loosened and a tilt/telescopic adjustment is performed.

[0063] The invention of claim 6 relates to the steering position adjustment device according to claims 1, 2, 3, 4 or 5, wherein said retaining member 7 is provided with a latching portion 7 c, for latching at least either one of said arm member 6 or operating lever member 9, whereby the latching portion 7 c is enabled to serve as a stopper of operating lever member 9, and the structure can be simplified.

[0064] The invention of claim 7 relates to the steering position adjustment device according to claim 1, wherein a head side retaining member 12, for holding said clamping/fastening bolts 5, 5 so as to be spaced by a predetermined distance, is provided on the bolt head portions 5 b, 5 b of said clamping/fastening bolts 5, 5, whereby it is enabled to keep the predetermined distance both on the bolt head portions 5 b, 5 b side of the above-mentioned clamping/fastening bolts 5, 5, and on the side where the above-mentioned arm member 6 and operating lever member 9, respectively, are screwed thereto. Therefore, it is possible stabilize and retain the clamping/fastening bolts 5, 5, and can improve the operability thereof, and provide better operating feeling. 

What is claimed is:
 1. A steering position adjustment device, comprising: a fixed bracket; a movable bracket, to which a steering column is attached; two sets of through holes consisting of front and back through hole sets, which are formed in said fixed bracket and movable bracket, respectively, and at least one set of which is constituted by a transverse slot and a vertical slot intersecting each other; two clamping/fastening bolts which are inserted through said through holes; an arm member, which screws on each of the clamping/fastening bolts; an operating lever member; a retaining member for holding the clamping/fastening bolts which are screwed in said arm member and operating lever member, respectively, at the centers of turning thereof, so as to be spaced by a predetermined distance; and a linking member 8 which pivotally links to said arm member and operating lever member.
 2. The steering position adjustment device according to claim 1, wherein a shaft support distance La defined between the axes of the clamping/fastening bolts held by said retaining member is different from a pivotal linkage distance Lb between the pivotal axes of said linking member.
 3. The steering position adjustment device according to claim 2, wherein the pivotal linkage distance Lb of said linking member is smaller than the shaft support distance La of said retaining member.
 4. The steering position adjustment device according to claim 2, wherein the pivotal linkage distance Lb of said linking member is larger than the shaft support distance La said retaining member.
 5. The steering position adjustment device according to claim 1, 2, 3 or 4, wherein said retaining member forms a recessed portion, which does not make contact with either said fixed bracket or movable bracket.
 6. The steering position adjustment device according to claim 1, 2, 3, 4 or 5, wherein said retaining member is provided with a latching portion, for latching at least either one of said arm member or operating lever member.
 7. The steering position adjustment device according to claim 1, wherein a head side retaining member, for holding said clamping/fastening bolts so as to be spaced by a predetermined distance, is provided on the bolt head portions of said clamping/fastening bolts. 